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Integrated Circuit Systems, Inc.
ICS951901
Programmable Frequency Generator & Integrated Buffers for Pentium III Processor
Recommended Application: Single chip clock solution for IA platform. Output Features: * 3 - CPU @ 2.5V * 13 - SDRAM @ 3.3V * 6 - PCI @3.3V, * 2 - AGP @ 3.3V * 1 - 48MHz, @3.3V fixed. * 1 - 24/48MHz, @3.3V selectable by I2C (Default is 24MHz) * 2 - REF @3.3V, 14.318MHz. Features: * Programmable ouput frequency. * Programmable ouput rise/fall time. * Programmable SDRAM and CPU skew. * Spread spectrum for EMI control typically by 7dB to 8dB, with programmable spread percentage. * Watchdog timer technology to reset system if over-clocking causes malfunction. * Uses external 14.318MHz crystal. * FS pins for frequency select Skew Specifications: * CPU - CPU: < 175ps * SDRAM - SDRAM < 250ps (except SDRAM12) * PCI - PCI: < 500ps * CPU (early) - PCI: 1-4ns (typ. 2ns)
Pin Configuration
VDDA *(AGPSEL)REF0 1 *(FS3)REF1 GND X1 X2 VDDPCI *(FS1)PCICLK_F *(FS2)PCICLK0 PCICLK1 PCICLK2 PCICLK3 PCICLK4 GND VDDAGP AGPCLK0 AGPCLK1 GND GND *(FS0)48MHz *(MODE)24_48MHz VDD48 SDATA SCLK
1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
VDDL CPUCLK0 CPUCLK1 CPUCLK2 GND VDDSDR SDRAM0 SDRAM1 SDRAM2 GND SDRAM3 SDRAM4 SDRAM5 VDDSDR SDRAM6 SDRAM7 GND SDRAM8/PD# SDRAM9/SDRAM_STOP# GND SDRAM10/PCI_STOP# SDRAM11/CPU_STOP# SDRAM12 VDDSDR
48-Pin 300mil SSOP
* These inputs have a 120K pull down to GND. 1 These are double strength.
Block Diagram
PLL2 /2 X1 X2 XTAL OSC PLL1 Spread Spectrum 48MHz 24_48MHz
Functionality
Bit2 FS3 Bit7 FS2 Bit6 FS1 Bit5 FS0 Bit4 CPU MHz SDRAM MHz PCI MHz AGP1 SEL=1 AGP0 SEL=0
2
REF(1:0)
CPU DIVDER
Stop
3
CPUCLK (2:0)
SDRAM DIVDER
Stop
13
SDRAM (12:0)
SDATA SCLK FS(3:0) PD# PCI_STOP# CPU_STOP# SDRAM_STOP# MODE AGP_SEL
Control Logic
PCI DIVDER
Stop
5
PCICLK (4:0) PCICLK_F
AGP DIVDER
Config. Reg.
2
AGP (1:0)
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
66.67 66.67 66.67 75.00 83.31 90.00 95.00 100.00 100.00 100.00 105.00 112.00 117.99 124.09 133.34 133.34
ICS951901
66.67 100.00 133.34 75.00 83.31 90.00 95.00 66.67 100.00 133.34 105.00 112.00 117.99 124.09 100.00 133.34
33.33 33.33 33.33 37.50 33.32 30.00 31.67 33.33 33.33 33.33 35.00 33.60 35.40 31.02 33.33 33.33
66.67 66.67 66.67 75.00 66.64 60.00 63.33 66.67 66.67 66.67 70.00 67.20 70.80 62.05 66.67 66.67
64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64
0670B--07/15/04
ICS951901
General Description
The ICS951901 is a single chip clock solution for desktop designs using 630S chipsets. It provides all necessary clock signals for such a system. The ICS951901 belongs to ICS new generation of programmable system clock generators. It employs serial programming I2C interface as a vehicle for changing output functions, changing output frequency, configuring output strength, configuring output to output skew, changing spread spectrum amount, changing group divider ratio and dis/enabling individual clocks. This device also has ICS propriety 'Watchdog Timer' technology which will reset the frequency to a safe setting if the system becomes unstable from over clocking.
Power Groups
Analog VDDA = X1, X2, Core, PLL VDD48 = 48MHz, 24MHz, fixed PLL Digital VDDPCI = PCICLK_F, PCICLK VDDSDR = SDRAM VDDAGP=AGP, REF MODE Pin Power Management Control Input
M ODE Pin 21 0 1 Pin 27 SDRAM11 CPU_STOP# Pin 28 SDRAM10 PCI_STOP# Pin 30 SDRAM9 SDRAM_STOP# Pin 31 SDRAM8 PD#
Pin Configuration
PIN NUMBER 1, 7, 15, 22, 25, 35, 43 2 3 4, 14, 18, 19, 29, 32, 39, 44 5 6 8 9 13, 12, 11, 10 17, 16, 20 PIN NAME VDD AGPSEL REF0 FS3 REF1 GND X1 X2 FS1 PCICLK_F FS2 PCICLK0 PCICLK (4:1) AGP (1:0) FS0 48MHz MODE 24_48MHz 23 24 27 SDATA SCLK CPU_STOP# SDRAM11 28 PCI_STOP# SDRAM10 SDRAM9 30 SDRAM_STOP# PD# SDRAM8 26 33, 34, 36, 37, 38, 40, 41, 42 45, 46, 47 48
0670B--07/15/04
TYPE PWR IN OUT IN OUT PWR IN OUT IN OUT IN OUT OUT OUT IN OUT IN OUT I/O IN IN OUT IN OUT OUT IN IN OUT OUT OUT PWR
DESCRIPTION 3.3V Power supply for SDRAM output buffers, PCI output buffers, reference output buffers and 48MHz output AGP frequency select pin. 14.318 MHz reference clock. Frequency select pin. 14.318 MHz reference clock. Ground pin for 3V outputs. Crystal input,nominally 14.318MHz. Crystal output, nominally 14.318MHz. Frequency select pin. PCI clock output, not affected by PCI_STOP# Frequency select pin. PCI clock output. PCI clock outputs. AGP outputs defined as 2X PCI. These may not be stopped. Frequency select pin. 48MHz output clock Pin 27, 28, 30, & 31 function select pin 0=Desktop 1=Mobile mode Clock output for super I/O/USB default is 24MHz Data pin for I2C circuitry 5V tolerant Clock pin of I2C circuitry 5V tolerant Stops all PCICLKs besides the PCICLK_F clocks at logic 0 level, when input is low and MODE pin is in Mobile mode SDRAM clock output Stops all CPUCLKs clocks at logic 0 level, when input is low and MODE pin is in Mobile mode SDRAM clock output SDRAM clock output Stops all SDRAM clocks at logic 0 level, when input is low and MODE pin is in Mobile mode Asynchronous active low input pin used to power down the device into a low power state. The internal clocks are disabled and the VCO and the crystal are stopped. The latency of the power down will not be greater than 3ms SDRAM clock output SDRAM clock outputs CPU clock outputs. Power pin for the CPUCLKs. 2.5V
21
31
SDRAM (12, 7:0) CPUCLK (2:0) VDDL
2
ICS951901
Serial Configuration Command Bitmap
Byte0: Functionality and Frequency Select Register (default = 0)
FS3 Bit7 FS2 Bit6 FS1 Bit5 FS0 Bit4 CPU MHz Description SDRAM PCI MHz MHz AGP1 SEL=1 AGP0 SEL=0 Spread % 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread center spread 0 1 0 PWD
Bit
Bit2
Bit 2 Bit 7:4
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
66.67 66.67 66.67 75.00 83.31 90.00 95.00 100.00 100.00 100.00 105.00 112.00 117.99 124.09 133.34 133.34 75.00 75.00 75.00 83.31 83.32 90.00 90.00 95.00 95.00 105.00 105.00 112.00 117.99 124.09 129.99 140.00
66.67 100.00 133.34 75.00 83.31 90.00 95.00 66.67 100.00 133.34 105.00 112.00 117.99 124.09 100.00 133.34 100.00 112.50 150.00 111.07 166.65 60.00 120.00 63.33 126.66 70.00 140.00 84.00 88.49 93.07 97.49 105.00
33.33 33.33 33.33 37.50 33.32 30.00 31.67 33.33 33.33 33.33 35.00 33.60 35.40 31.02 33.33 33.33 37.50 32.14 32.14 33.32 31.25 30.00 30.00 31.67 31.67 35.00 35.00 33.60 35.40 31.02 32.50 35.00
66.67 66.67 66.67 75.00 66.64 60.00 63.33 66.67 66.67 66.67 70.00 67.20 70.80 62.05 66.67 66.67 75.00 64.29 64.29 66.64 62.49 60.00 60.00 63.33 63.33 70.00 70.00 67.20 70.80 62.05 64.99 70.00
64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64
00000 Note1
Bit 3 Bit 1 Bit 0
0 - Frequency is selected by hardware select, Latched inputs 1 - Frequency is selected by Bit, 2 7:4 0 - Normal 1 - Spread Spectrum Enabled 0 - Running 1 - Tristate all outputs
Note1: Default at power-up will be for latched logic inputs to define frequency, as displayed by Bit 3. Note: PWD = Power-Up Default
0670B--07/15/04
I2C is a trademark of Philips Corporation
3
ICS951901
Byte 1: CPU, Active/Inactive Register (1= enable, 0 = disable)
Byte 2: PCI, Active/Inactive Register (1= enable, 0 = disable)
BIT Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PIN# 47 46 45 -
PWD 1 1 1 1 1 1 1 1
DESCRIPTION Sel24_48 (1:24MHz, 0:48MHz) R e s e r ve d R e s e r ve d R e s e r ve d CPUCLK0 CPUCLK1 CPUCLK2 R e s e r ve d
BIT Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PIN# 13 12 11 10 9 8
PWD 1 1 1 1 1 1 1 1
DESCRIPTION R e s e r ve d R e s e r ve d PCICLK4 PCICLK3 PCICLK2 PCICLK1 PCICLK0 PCICLK_F
Byte 3: SDRAM, Active/Inactive Register (1= enable, 0 = disable)
Byte 4: SDRAM , Active/Inactive Register (1= enable, 0 = disable)
BIT Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PIN# 33 34 36 37 38 40 41 42
PWD 1 1 1 1 1 1 1 1
DESCRIPTION SDRAM7 SDRAM6 SDRAM5 SDRAM4 SDRAM3 SDRAM2 SDRAM1 SDRAM0
BIT PIN# PWD Bit 7 1 Bit 6 21 1 Bit 5 20 1 Bit 4 26 1 Bit 3 27 1 Bit 2 28 1 Bit 1 30 1 Bit 0 31 1
DESCRIPTION R e s e r ve d 24_48MHz 48MHz SDRAM12 SDRAM11 SDRAM10 SDRAM9 SDRAM8
Byte 5: AGP, Active/Inactive Register (1= enable, 0 = disable)
BIT PIN# PWD Bit 7 X Bit 6 X Bit 5 X Bit 4 X Bit 3 3 1 Bit 2 2 1 Bit 1 17 1 Bit 0 16 1
Notes:
DESCRIPTION FS3 (Readback) FS2 (Readback) FS1 (Readback) FS0 (Readback) REF0 REF1 AGPCLK1 AGPCLK0
1. Inactive means outputs are held LOW and are disabled from switching. 2. Latched Frequency Selects (FS#) will be inverted logic load of the input frequency select pin conditions.
0670B--07/15/04
4
ICS951901
Byte 6: Control , Active/Inactive Register (1= enable, 0 = disable)
BIT Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
PIN# 2,3 45 -
PWD DESCRIPTION 0 REF strength 0=1X, 1=2X CPUCLK2 - Stop - Control 0 0 = C P U _ S TO P # w i l l c o n t r o l C P U C L K 2 , 1=CPUCLK2 is free running even if CPU_STOP# is low X AGPSEL (Readback) X MODE (Readback) X C P U _ S TO P # ( R e a d b a c k ) X P C I _ S TO P # ( R e a d b a c k ) X S D R A M _ S TO P # ( R e a d b a c k ) AGP Speed Toggle 0 0=AGPSEL (pin2) will be determined by latch input setting, 1=AGPSEL will be opposite of latch input setting
Byte 7: Vendor ID Register (1= enable, 0 = disable)
Byte 8: Byte Count and Read Back Register (1= enable, 0 = disable)
BIT PIN# PWD Bit 7 0 Bit 6 0 Bit 5 1 Bit 4 0 Bit 3 1 Bit 2 0 Bit 1 0 Bit 0 1
DESCRIPTION Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved
BIT PIN# PWD Bit 7 0 Bit 6 0 Bit 5 0 Bit 4 0 Bit 3 0 Bit 2 1 Bit 1 0 Bit 0 0
DESCRIPTION Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved
Byte 9: Watchdog Timer Count Register
Byte 10: VCO Control Selection Bit & Watchdog Timer Control Register
Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PWD 0 0 0 1 0 0 0 0
Description The decimal representation of these 8 bits correspond to 290ms or 1ms the watchdog timer will wait before it goes to alarm mode and reset the frequency to the safe setting. Default at power up is 16X 290ms = 4.6 seconds.
Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PWD 0 0 0 0 0 0 0 0
Description 0=Hw/B0 freq / 1=B11 & 12 freq WD Enable 0=disable / 1=enable WD Status 0=normal / 1=alarm WD Safe Frequency, Byte 0 bit 2 WD Safe Frequency, FS3 WD Safe Frequency, FS2 WD Safe Frequency, FS1 WD Safe Frequency, FS0
Note: FS values in bit [0:4] will correspond to Byte 0 FS values. Default safe frequency is same as 00000 entry in byte0.
0670B--07/15/04
5
ICS951901
Byte 11: VCO Frequency Control Register
Byte 12: VCO Frequency Control Register
Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PWD X X X X X X X X
Description VCO Divider Bit0 REF Divider Bit6 REF Divider Bit5 REF Divider Bit4 REF Divider Bit3 REF Divider Bit2 REF Divider Bit1 REF Divider Bit0
Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PWD X X X X X X X X
Description VCO Divider Bit8 VCO Divider Bit7 VCO Divider Bit6 VCO Divider Bit5 VCO Divider Bit4 VCO Divider Bit3 VCO Divider Bit2 VCO Divider Bit1
Note: The decimal representation of these 7 bits (Byte 11 [6:0]) + 2 is equal to the REF divider value .
Notes: 1. PWD = Power on Default Byte 13: Spread Sectrum Control Register
Note: The decimal representation of these 9 bits (Byte 12 bit [7:0] & Byte 11 bit [7] ) + 8 is equal to the VCO divider value. For example if VCO divider value of 36 is desired, user need to program 36 - 8 = 28, namely, 0, 00011100 into byte 12 bit & byte 11 bit 7.
Byte 14:
Spread Sectrum Control Register
Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PWD X X X X X X X X
Description Spread Spectrum Bit7 Spread Spectrum Bit6 Spread Spectrum Bit5 Spread Spectrum Bit4 Spread Spectrum Bit3 Spread Spectrum Bit2 Spread Spectrum Bit1 Spread Spectrum Bit0
Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PWD X X X X X X X X
Description Reserved Reserved Reserved Spread Spectrum Bit12 Spread Spectrum Bit11 Spread Spectrum Bit10 Spread Spectrum Bi 9 Spread Spectrum Bit8
Note: Please utilize software utility provided by ICS Application Engineering to configure spread spectrum. Incorrect spread percentage may cause system failure.
Note: Please utilize software utility provided by ICS Application Engineering to configure spread spectrum. Incorrect spread percentage may cause system failure.
Byte 15: Output Skew Control
Byte 16: Output Skew Control
Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PWD 1 0 0 1 1 1 1 0
Description SDRAM 12 Skew Control SDRAM (11:0) Skew Control CPUCLK2 Skew Control CPUCLK (1:0) Skew Control
Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PWD X X X X X X X X
Description Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved
0670B--07/15/04
6
ICS951901
Byte 17: Output Rise/Fall Time Select Register
Byte 18: Output Rise/Fall Time Select Register
Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PWD Description 1 PCI (3:0) Slew Rate Control 0 1 PCI_F Slew Rate Control 0 1 CPUCLK2 Slew Rate Control 0 0 CPUCLK1 Slew rate Control
Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PWD 1 0 1 0 1 0 1 0
Description SDRAM12: Slew Rate Control AGPCLK1: Slew Rate Control AGPCLK0: Slew Rate Control PCICLK4: Slew Rate Control
Byte 19: Output Rise/Fall Time Select Register
Byte 20: Output Rise/Fall Time Select Register
Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PWD 1 0 1 0 1 0 1 0
Description 48MHz: Slew Rate Control 24_48MHz: Slew Rate Control REF1: Slew Rate Control REF0: Slew Rate Control SDRAM (11:0): Slew Rate Control
Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PWD 0 0 0 0 0 0 0
Description Reserved Reserved Reserved Reserved Reserved Reserved CPUCLK0 Slew Rate Control
VCO Programming Constrains
VCO Frequency ...................... 150MHz to 500MHz VCO Divider Range ................ 8 to 519 REF Divider Range ................. 2 to 129 Phase Detector Stability .......... 0.3536 to 1.4142
Useful Formula VCO Frequency = 14.31818 x VCO/REF divider value Phase Detector Stabiliy = 14.038 x (VCO divider value)-0.5
To program the VCO frequency for over-clocking. 0. Before trying to program our clock manually, consider using ICS provided software utilities for easy programming. 1. Select the frequency you want to over-clock from with the desire gear ratio (i.e. CPU:SDRAM:3V66:PCI ratio) by writing to byte 0, or using initial hardware power up frequency. 2. Write 0001, 1001 (19H) to byte 8 for readback of 21 bytes (byte 0-20). 3. Read back byte 11-20 and copy values in these registers. 4. Re-initialize the write sequence. 5. Write a '1' to byte 9 bit 7 and write to byte 11 & 12 with the desired VCO & REF divider values. 6. Write to byte 13 to 20 with the values you copy from step 3. This maintains the output spread, skew and slew rate. 7. The above procedure is only needed when changing the VCO for the 1st pass. If VCO frequency needed to be changed again, user only needs to write to byte 11 and 12 unless the system is to reboot.
0670B--07/15/04
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ICS951901
Absolute Maximum Ratings
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . Ambient Operating Temperature . . . . . . . . . . Case Temperature . . . . . . . . . . . . . . . . . . . . . . Storage Temperature . . . . . . . . . . . . . . . . . . . . 5.5 V GND -0.5 V to VDD +0.5 V 0C to +70C 115C -65C to +150C
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only and functional operation of the device at these or any other conditions above those listed in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.
Electrical Characteristics - Input/Supply/Common Output Parameters
TA = 0 - 70C; Supply Volt age VDD = 3.3 V +/-5%VDDL = 2.5 V +/-5% (unless otherwise stated) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 2 VDD + 0.3 V Input High Voltage VIH Input Low Voltage Supply Current Power Down Input frequency 1 Input Capacitance Transition Time Settling Time 1 Clk Stabilization Skew Skew
1
VIL IDD PD Fi CIN CINX Ttrans TS TSTAB TCPU-PCI TCPU-SDRAM CL=30 pF, CPU @ 66, 100 MHz VDD = 3.3 V; Logic Inputs X1 & X2 pins To 1st crossing of target Freq. From 1st crossing to 1% target Freq. From VDD= 3.3 V to 1% target Freq. CPUVT= 1.5 V PCI VT=1.25V CPUVT= 1.5 V SDRAM VT=1.25
VSS - 0.3 390 300 14.32
0.8 400 600 16 5 45 3 3
V mA
mA
12 27
MHz pF pF
ms ns ps
1 -500
1.9 -300
4 0
Guaranteed by design, not 100% tested in production.
0670B--07/15/04
8
ICS951901
Electrical Characteristics - CPU
TA = 0 - 70C; VDDL = 2.5 V +/-5%; VDDL = 2.5 V +/-5%; CL = 10-20 pF (unless otherwise specified) PARAMETER Output Impedance Output Impedance1 Output High Voltage Output Low Voltage Output High Current Output Low Current Rise Time1 Fall Time1 Duty Cycle1 Skew window Skew window
1 0:1 0:2 1 1
SYMBOL RDSP2B RDSN2B VOH2B VOL2B I OH2B I OL2B t r2B t f2B dt2B tsk2B tsk2B t jcyc-cyc
CONDITIONS VO = VDD*(0.5) VO = VDD*(0.5) I OH = -12.0 mA I OL = 12 mA VOH = 1.7 V VOL = 0.7 V VOL = 0.4 V, VOH = 2.0 V VOH = 2.0 V, V OL = 0.4 V VT = 1.25 V VT = 1.25 V VT = 1.25 V VT = 1.25 V, CPU=66 MHz
MIN 10 10 2
TYP
19 0.4 0.4 45
1.2 1.1 46.9 43 142 177
MAX UNITS 20 20 V 0.4 V -19 mA mA 1.6 ns 1.6 ns 55 175 375 250 % ps ps ps
Jitter, Cycle-to-cycle
Guaranteed by design, not 100% tested in production.
Electrical Characteristics - 24-48MHz
TA = 0 - 70C; VDD = 3.3 V +/-5%;VDDL = 2.5 V +/-5%; CL = 10-20 pF (unless otherwise specified) PARAMETER Output Impedance Output Impedance Output High Voltage Output Low Voltage Output High Current Output Low Current Rise Time1 Fall Time
1 1
SYMBOL RDSP5B
1
CONDITIONS VO = VDD*(0.5) VO = VDD*(0.5) I OH = -14 mA I OL = 6.0 mA VOH = 2.0 V VOL = 0.8 V VOL = 0.4 V, V OH = 2.4 V VOH = 2.4 V, VOL = 0.4 V VT = 1.5 V VT = 1.5 V
MIN 20 20 2.4
TYP
MAX UNITS 60 60 0.4 -20 V V mA mA ns ns % ps
RDSN5B1 VOH15 VOL5 I OH5 I OL5 t r5 t f5 dt5 t cycle to cycle
10 0.4 0.4 45 1.45 1.5 52.5 210 4 4 55 500
Duty Cycle Jitter
1
Guaranteed by design, not 100% tested in production.
0670B--07/15/04
9
ICS951901
Electrical Characteristics - PCI
TA = 0 - 70C; VDD = 3.3 V +/-5%; VDDL = 2.5 V +/-5%; CL = 10-30 pF (unless otherwise specified) PARAMETER Output Impedance Output Impedance Output High Voltage Output Low Voltage Output High Current Output Low Current Rise Time1 Fall Time
1 1
SYMBOL RDSP1B1 RDSN1B1 VOH1 VOL1 I OH1 I OL1 t r1 t f1 dt1 t sk1 t jcyc-cyc1
CONDITIONS VO = VDD*(0.5) VO = VDD*(0.5) I OH = -1 mA I OL = 1 mA VOH @ MIN = 1.0 V VOL @ MIN = 1.95 V VOL = 0.4 V, VOH = 2.4 V VOH = 2.4 V, V OL = 0.4 V VT = 1.5 V VT = 1.5 V VT = 1.5 V
MIN 12 12 2.4
TYP
MAX UNITS 55 55 0.55 -29 V V mA mA ns ns % ps ps
29 0.5 0.5 45 2.3 2.3 51.2 108 353 2.5 2.5 55 500 500
Duty Cycle Skew window1 Jitter, Cycle-to-cycle1
1
Guaranteed by design, not 100% tested in production.
Electrical Characteristics - SDRAM
TA = 0 - 70C; VDD = 3.3 V +/-5%;VDDL = 2.5 V +/-5%; CL = 20-30 pF (unless otherwise specified) PARAMETER Output Impedance Output Impedance Output High Voltage Output Low Voltage Output High Current Output Low Current Rise Time1 Fall Time
1 1
SYMBOL RDSP3B1 RDSN3B1 VOH3 VOL3 I OH3 I OL3 tr3 tf3 dt3 t sk3 t sk3
1
CONDITIONS VO = VDD*(0.5) VO = VDD*(0.5) I OH = -18 mA I OL = 9.4 mA VOH = 2.0 V VOL = 0.8V VOL = 0.4 V, VOH = 2.4 V VOH = 2.4 V, VOL = 0.4 V VT = 1.5 V VT = 1.5 V VT = 1.5 V VT = 1.5 V, CPU=66,100,133 MHz
MIN 10 10 2.4
TYP
MAX UNITS 24 24 0.4 -46 V V mA mA ns ns % ps ps ps
0.8 45 0.8 48.5 192 290 173
1.6 1.6 55 250 500 250
Duty Cycle Skew window1(0:11) Skew window
1 1( 0:12)
Jitter, Cycle-to-cycle
t jcyc-cyc3
Guaranteed by design, not 100% tested in production.
0670B--07/15/04
10
ICS951901
Electrical Characteristics - AGP
TA = 0 - 70C; VDD=3.3V +/-5%; CL = 20 pF (unless otherwise specified) PARAMETER Output Impedance Output Impedance Output High Voltage Output Low Voltage Output High Current Output Low Current Rise Time1 Fall Time
1 1
SYMBOL RDSP4B
1
CONDITIONS VO=VDD*(0.5) VO=VDD*(0.5) I OH = -18 mA I OL = 18 mA VOH = 2.0 V VOL = 0.8 V VOL = 0.4 V, V OH = 2.4 V VOH = 2.4 V, VOL = 0.4 V VT = 1.5 V VT = 1.5 V VT = 1.5 V
MIN 12 12 2
TYP
MAX UNITS 55 55 0.4 -19 V V mA mA ns ns % ps ps
RDSN4B1 VOH4B VOL4B I OH4B IOL4B t r4B t f4B dt4B tsk 1 tjcyc-cyc 1
19 0.5 0.5 45 1.5 1.6 52.3 55.5 239 2 2 55 175 500
Duty Cycle Skew window1 Jitter Cyc-Cyc
1
Guaranteed by design, not 100% tested in production.
Electrical Characteristics - REF
TA = 0 - 70C; VDD = 3.3 V +/-5%;VDDL = 2.5 V +/-5%; CL = 20 pF (unless otherwise stated) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output High Voltage V OH5 I OH = -12 mA 2.4 V Output Low Voltage V OL5 IOL = 9 mA 0.4 V Output High Current I OH5 VOH = 2.0 V -22 mA Output Low Current I OL5 VOL = 0.8 V 16 mA 1 Rise Time tr5 VOL = 0.4 V, VOH = 2.4 V 1.8 4 ns Fall Time1 tf5 VOH = 2.4 V, VOL = 0.4 V 1.9 4 ns Duty Cycle1 dt5 V T = 50% 45 54.5 55 %
1
Guaranteed by design, not 100% tested in production.
0670B--07/15/04
11
ICS951901
General I2C serial interface information for the ICS951901 How to Write:
Controller (host) sends a start bit. Controller (host) sends the write address D2 (H) ICS clock will acknowledge Controller (host) sends a dummy command code ICS clock will acknowledge Controller (host) sends a dummy byte count ICS clock will acknowledge Controller (host) starts sending Byte 0 through Byte 28 (see Note 2) * ICS clock will acknowledge each byte one at a time * Controller (host) sends a Stop bit * * * * * * * *
How to Read:
* * * * * * * Controller (host) will send start bit. Controller (host) sends the read address D3 (H) ICS clock will acknowledge ICS clock will send the byte count Controller (host) acknowledges ICS clock sends Byte 0 through byte 6 (default) ICS clock sends Byte 0 through byte X (if X(H) was written to byte 6). * Controller (host) will need to acknowledge each byte * Controller (host) will send a stop bit
How to Write:
Controller (Host) Start Bit Address D2(H) Dummy Command Code ACK Dummy Byte Count ACK Byte 0 ACK Byte 1 ACK Byte 2 ACK Byte 3 ACK Byte 4 ACK Byte 5 ACK Byte 6 ACK ICS (Slave/Receiver)
How to Read:
Controller (Host) Start Bit Address D3(H) ICS (Slave/Receiver)
ACK
ACK
ACK Byte Count Byte 0 ACK Byte 1 ACK Byte 2 ACK Byte 3 ACK Byte 4 ACK Byte 5 ACK Byte 6 ACK If 7H has been written to B6 ACK Byte 7
Byte 18 ACK Byte 19 ACK Byte 20 ACK Stop Bit
If 1AH has been written to B6 ACK If 1BH has been written to B6 ACK If 1CH has been written to B6 ACK Stop Bit Byte18 Byte 19 Byte 20
*See notes on the following page.
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ICS951901
Brief I2C registers description for ICS951901 Programmable System Frequency Generator
Register Name Functionality & Frequency Select Register Output Control Registers Byte 0 Description Output frequency, hardware / I C frequency select, spread spectrum & output enable control register. Active / inactive output control registers/latch inputs read back. Byte 11 bit[7:4] is ICS vendor id 1001. Other bits in this register designate device revision ID of this part. Writing to this register will configure byte count and how many byte will be read back. Do not write 00H to this byte. Writing to this register will configure the number of seconds for the watchdog timer to reset. Watchdog enable, watchdog status and programmable 'safe' frequency' can be configured in this register. This bit select whether the output frequency is control by hardware/byte 0 configurations or byte 11&12 programming. These registers control the dividers ratio into the phase detector and thus control the VCO output frequency. These registers control the spread percentage amount. Increment or decrement the group skew amount as compared to the initial skew. These registers will control the output rise and fall time.
2
PWD Default See individual byte description See individual byte description See individual byte description
1-6
Vendor ID & Revision ID Registers
7
Byte Count Read Back Register
8
08H
Watchdog Timer Count Register
9
10H
Watchdog Control Registers
10 Bit [6:0]
000,0000
VCO Control Selection Bit
10 Bit [7]
0
VCO Frequency Control Registers Spread Spectrum Control Registers Group Skews Control Registers Output Rise/Fall Time Select Registers
11-12
Depended on hardware/byte 0 configuration Depended on hardware/byte 0 configuration See individual byte description See individual byte description
13-14
15-16
17-20
Notes:
1. The ICS clock generator is a slave/receiver, I2C component. It can read back the data stored in the latches for verification. Readback will support standard SMBUS controller protocol. The number of bytes to readback is defined by writing to byte 8. When writing to byte 11 - 12, and byte 13 - 14, they must be written as a set. If for example, only byte 14 is written but not 15, neither byte 14 or 15 will load into the receiver. The data transfer rate supported by this clock generator is 100K bits/sec or less (standard mode) The input is operating at 3.3V logic levels. The data byte format is 8 bit bytes. To simplify the clock generator I2C interface, the protocol is set to use only Block-Writes from the controller. The bytes must be accessed in sequential order from lowest to highest byte with the ability to stop after any complete byte has been transferred. The Command code and Byte count shown above must be sent, but the data is ignored for those two bytes. The data is loaded until a Stop sequence is issued. At power-on, all registers are set to a default condition, as shown.
2. 3. 4. 5. 6.
7.
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ICS951901
Shared Pin Operation Input/Output Pins
The I/O pins designated by (input/output) on the ICS951901 serve as dual signal functions to the device. During initial power-up, they act as input pins. The logic level (voltage) that is present on these pins at this time is read and stored into a 5-bit internal data latch. At the end of PowerOn reset, (see AC characteristics for timing values), the device changes the mode of operations for these pins to an output function. In this mode the pins produce the specified buffered clocks to external loads. To program (load) the internal configuration register for these pins, a resistor is connected to either the VDD (logic 1) power supply or the GND (logic 0) voltage potential. A 10 Kilohm (10K) resistor is used to provide both the solid CMOS programming voltage needed during the power-up programming period and to provide an insignificant load on the output clock during the subsequent operating period. Figure 1 shows a means of implementing this function when a switch or 2 pin header is used. With no jumper is installed the pin will be pulled high. With the jumper in place the pin will be pulled low. If programmability is not necessary, than only a single resistor is necessary. The programming resistors should be located close to the series termination resistor to minimize the current loop area. It is more important to locate the series termination resistor close to the driver than the programming resistor.
Programming Header Via to Gnd Device Pad 2K W
Via to VDD
8.2K W Clock trace to load Series Term. Res.
Fig. 1
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ICS951901
CPU_STOP# Timing Diagram
CPU_STOP# is an asychronous input to the clock synthesizer. It is used to turn off the CPU clocks for low power operation. CPU_STOP# is synchronized by the ICS94209. The minimum that the CPU clock is enabled (CPU_STOP# high pulse) is 100 CPU clocks. All other clocks will continue to run while the CPU clocks are disabled. The CPU clocks will always be stopped in a low state and start in such a manner that guarantees the high pulse width is a full pulse. CPU clock on latency is less than 4 CPU clocks and CPU clock off latency is less than 4 CPU clocks.
Notes: 1. All timing is referenced to the internal CPU clock. 2. CPU_STOP# is an asynchronous input and metastable conditions may exist. This signal is synchronized to the CPU clocks inside the ICS94209. 3. All other clocks continue to run undisturbed. (including SDRAM outputs).
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ICS951901
PCI_STOP# Timing Diagram
PCI_STOP# is an asynchronous input to the ICS94209. It is used to turn off the PCICLK clocks for low power operation. PCI_STOP# is synchronized by the ICS94209 internally. The minimum that the PCICLK clocks are enabled (PCI_STOP# high pulse) is at least 10 PCICLK clocks. PCICLK clocks are stopped in a low state and started with a full high pulse width guaranteed. PCICLK clock on latency cycles are only one rising PCICLK clock off latency is one PCICLK clock.
Notes: 1. All timing is referenced to the Internal CPUCLK (defined as inside the ICS94209 device.) 2. PCI_STOP# is an asynchronous input, and metastable conditions may exist. This signal is required to be synchronized inside the ICS94209. 3. All other clocks continue to run undisturbed. 4. CPU_STOP# is shown in a high (true) state.
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ICS951901
SDRAM_STOP# Timing Diagram
SDRAM_STOP# is an asychronous input to the clock synthesizer. It is used to stop SDRAM clocks for low power operation. SDRAM_STOP# is synchronized to complete it's current cycle, by the ICS94209. All other clocks will continue to run while the SDRAM clocks are disabled. The SDRAM clocks will always be stopped in a low state and start in such a manner that guarantees the high pulse width is a full pulse.
Notes: 1. All timing is referenced to the internal CPU clock. 2. SDRAM is an asynchronous input and metastable conditions may exist. This signal is synchronized to the SDRAM clocks inside the ICS94209. 3. All other clocks continue to run undisturbed.
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ICS951901
PD# Timing Diagram
The power down selection is used to put the part into a very low power state without turning off the power to the part. PD# is an asynchronous active low input. This signal needs to be synchronized internal to the device prior to powering down the clock synthesizer. Internal clocks are not running after the device is put in power down. When PD# is active low all clocks need to be driven to a low value and held prior to turning off the VCOs and crystal. The power up latency needs to be less than 3 mS. The power down latency should be as short as possible but conforming to the sequence requirements shown below. PCI_STOP# and CPU_STOP# are considered to be don't cares during the power down operations. The REF and 48MHz clocks are expected to be stopped in the LOW state as soon as possible. Due to the state of the internal logic, stopping and holding the REF clock outputs in the LOW state may require more than one clock cycle to complete.
Notes: 1. All timing is referenced to the Internal CPUCLK (defined as inside the ICS94209 device). 2. As shown, the outputs Stop Low on the next falling edge after PD# goes low. 3. PD# is an asynchronous input and metastable conditions may exist. This signal is synchronized inside this part. 4. The shaded sections on the VCO and the Crystal signals indicate an active clock. 5. Diagrams shown with respect to 133MHz. Similar operation when CPU is 100MHz.
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N
c
SYMBOL
L
INDEX AREA
E1
E
12 D h x 45
a
A A1 b c D E E1 e h L N
In Millimeters COMMON DIMENSIONS MIN MAX 2.41 2.80 0.20 0.40 0.20 0.34 0.13 0.25 SEE VARIATIONS 10.03 10.68 7.40 7.60 0.635 BASIC 0.38 0.64 0.50 1.02 SEE VARIATIONS 0 8 VARIATIONS D mm. MIN MAX 15.75 16.00
In Inches COMMON DIMENSIONS MIN MAX .095 .110 .008 .016 .008 .0135 .005 .010 SEE VARIATIONS .395 .420 .291 .299 0.025 BASIC .015 .025 .020 .040 SEE VARIATIONS 0 8
A A1
-Ce
b SEATING PLANE .10 (.004) C
N 48
10-0034
D (inch) MIN .620 MAX .630
Reference Doc.: JEDEC Publication 95, MO-118
300 mil SSOP Package
Ordering Information
ICS951901yFLF-T
Example:
ICS XXXXXX y F LF- T
Designation for tape and reel packaging Lead Free (Optional) Package Type F = SSOP Revision Designator (will not correlate with datasheet revision) Device Type Prefix ICS = Standard Device
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